Malicious PDF — malware analysis report

Static analysis result for SHA-256 e492b500dd30c22f…

MALICIOUS

PDF

88.3 KB Created: 2021-07-21 22:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2a4778a7d021d1a25a4a696893e8f0e SHA-1: 84469f33aed8ab00362044c0257e5828b5f5331e SHA-256: e492b500dd30c22f6561d03746284772f22e738120635ad86a88696ac51daad7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l9ngpd14fsvjhc2alt7rrb8a8h/xibobitorije.pdf In PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/17368042467.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/gimevedotodomezisuje.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/xubozipaxege.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8e68c5ef41dd9aefd05608aee561c9c6/temejitivifiziwet.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cac0f49f214---54286050802.pdfIn PDF document text
    • http://donghotam.com/luutru/files/wividuverevazowusorati.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607cc309acfe4---85146106616.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160782b2c43598---radumadutugokufi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/67su6ntalh9odc20h7mldc5u3f/2410834848.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68b77c2ef0---35363334764.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb60b153fc---2054412710.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd606d564---39760719952.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/17618976854.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d3886d1a2c28cff708fbce5f48bd8f32/11911000355.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/fegadedefogogakife.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c20e16dc1429a223234288b34d901f23/ramovifel.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/gibakimuledotozegaduki.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca1efebf452bccbe4a934afd929d897e/68383133387.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/15289133743.pdfIn PDF document text
    • http://zxsolar.com/d/files/57059994957.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/tevek.pdfIn PDF document text
    • https://samtee.com/admin/images/file/13169796631.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3d9f5f0d22d1beadc1ca250e5ce3504a/lisupesefigogojep.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428085127140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=biological+functions+of+nucleic+acids+class+12PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 10876 bytes
SHA-256: a02c97339588f0eeedba3efb11aa948973bd2267146644efc13d0e98a8b68f53
font_01_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 17224 bytes
SHA-256: 531ba262f92e9050ba75f3e1814d83512ae8ae08da3c3e565e97135406c6d2d8
font_02_sfnt_off00013a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1